Reefneck you wrote-
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Actually, A Bubble Coral opens it's bubbles larger to block light. They are a low light demanding coral. They retract more when they are not getting enough light.
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That is crazy and the first tiem I have ever heard somebody say that. From all my reading and discussion with reef owners and care takers I have been told and seen the exact opposite. I have read well known books on corals that state the exact opposite.
The whle idea of a bubble coral expanding its bubbles and increasing its area is to capture more light. If you were a coral and needed more light why in the world woudl you decrease your ability to capture light by shrinking or retracting??? It jsut makes common sense that if a coral needs more light it will expand to try to capture as much as it can. It may not be true for every croal but it is defiitly true for bubble coral.
Where are you getting your information???